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help / color / mirror / Atom feedFrom: David G. Johnston <[email protected]>
To: [email protected]
Cc: pgsql-sql <[email protected]>
Subject: Re: Electricity bill
Date: Tue, 7 Jun 2022 18:47:17 -0700
Message-ID: <CAKFQuwaY-zeoWkJwqDP6TDZnowdif2AZsT28+-SA2OWc8KXKTA@mail.gmail.com> (raw)
In-Reply-To: <CAPDmd-CjfhW5pSkthOGmb1rDpznDWYOetrhVh1gcquwQM9n5eA@mail.gmail.com>
References: <CAPDmd-CjfhW5pSkthOGmb1rDpznDWYOetrhVh1gcquwQM9n5eA@mail.gmail.com>
On Tue, Jun 7, 2022 at 6:39 PM Theodore M Rolle, Jr. <[email protected]>
wrote:
> I'm putting in YYYY-MM-DD dates of electricity bills and would like to not
> have starting and ending dates in the same row. Only ending date.
> Will someone show me the SQL to compute the months’ usage? This requires
> retrieving two rows to compute the number of days...
>
You can use a window function called lead (or lag) to retrieve a value from
the next (previous) row and associate it with the current row.
David J.
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To: [email protected]
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Subject: Re: Electricity bill
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